{"id":15755,"date":"2026-02-26T20:42:19","date_gmt":"2026-02-26T20:42:19","guid":{"rendered":"https:\/\/fs-elliott.com\/?p=15755"},"modified":"2026-10-29T17:14:28","modified_gmt":"2026-10-29T17:14:28","slug":"acfm-vs-scfm-vs-fad-understanding-compressor-flow-measurements","status":"publish","type":"post","link":"https:\/\/www.fs-elliott.com\/fr\/blog\/acfm-vs-scfm-vs-fad-understanding-compressor-flow-measurements\/","title":{"rendered":"ACFM vs SCFM vs FAD: Understanding Compressor Flow Measurements"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"15755\" class=\"elementor elementor-15755\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0d5d7c9 e-flex e-con-boxed e-con e-parent\" data-id=\"0d5d7c9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-368fdab e-con-full e-flex e-con e-child\" data-id=\"368fdab\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b160d05 elementor-widget elementor-widget-heading\" data-id=\"b160d05\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">ACFM vs SCFM vs FAD: Understanding Compressor Flow Measurements<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-239099b elementor-widget elementor-widget-heading\" data-id=\"239099b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h6 class=\"elementor-heading-title elementor-size-default\">f\u00e9vrier 26, 2026<\/h6>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-da5e4b7 blog-float-image elementor-widget elementor-widget-image\" data-id=\"da5e4b7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"250\" src=\"https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Blog-Post-.png\" class=\"attachment-large size-large wp-image-14379\" alt=\"How Does a Centrifugal Compressor Work\" srcset=\"https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Blog-Post-.png 960w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Blog-Post--300x94.png 300w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Blog-Post--768x240.png 768w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Blog-Post--18x6.png 18w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Blog-Post--24x8.png 24w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Blog-Post--36x11.png 36w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Blog-Post--48x15.png 48w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-00c7ab3 e-flex e-con-boxed e-con e-parent\" data-id=\"00c7ab3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-baf6908 e-con-full blog-wrap e-flex e-con e-child\" data-id=\"baf6908\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5bc1333 elementor-widget elementor-widget-text-editor\" data-id=\"5bc1333\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size: 16px; line-height: 1.5;\"><p data-pm-slice=\"1 1 []\">Flow rate is one of the most cited and most misunderstood metrics in compressor performance. Terms such as ACFM, SCFM, mass flow, and Free Air Delivery are often used interchangeably, even though they represent fundamentally different measurements. For engineers, plant managers, and decision-makers evaluating air or process gas compressors, understanding how flow is defined and measured is essential, not just for selecting the right machine, but for comparing technologies accurately, validating performance claims, and ensuring the system operates as intended once installed.<\/p><p data-pm-slice=\"1 1 []\">If you are unsure which flow measurement to reference when comparing compressors, the best practice is to use SCFM. Standard Cubic Feet per Minute provides normalized conditions, making it the most consistent and reliable baseline for evaluating performance across manufacturers and operating environments.<\/p><p data-pm-slice=\"1 1 []\">That said, each flow definition serves a specific purpose. Below, we break down how air and gas flow are measured, why those measurements vary, and how engineers interpret flow data in real-world applications.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3f50ad9 e-flex e-con-boxed e-con e-parent\" data-id=\"3f50ad9\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-af949f9 e-con-full e-flex e-con e-child\" data-id=\"af949f9\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3ee270b elementor-widget elementor-widget-heading\" data-id=\"3ee270b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why Flow Measurement Is Inherently Complex<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t\n<hr class=\"e-40a33b7-5e9df32 e-divider-base\" data-interaction-id=\"40a33b7\"  data-e-type=\"widget\" data-id=\"40a33b7\" \/>\n\t\t\t\t<div class=\"elementor-element elementor-element-2391077 elementor-widget elementor-widget-text-editor\" data-id=\"2391077\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">Gas volume changes with pressure, temperature, and composition. As a result, the same compressor can appear to deliver very different flow rates depending on:<\/p><ul><li data-pm-slice=\"1 1 []\">Where the measurement is taken<\/li><li data-pm-slice=\"1 1 []\">What conditions is it measured at<\/li><li data-pm-slice=\"1 1 []\">Whether volume or mass is being measured<br \/><br \/><\/li><\/ul><p>This is why flow numbers must always be interpreted in context. From an OEM perspective, a single flow value without defined conditions is incomplete at best, and misleading at worst.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c44e3da e-flex e-con-boxed e-con e-parent\" data-id=\"c44e3da\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-9a81e45 e-con-full e-flex e-con e-child\" data-id=\"9a81e45\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ac1b83f elementor-widget elementor-widget-heading\" data-id=\"ac1b83f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">The Three Fundamental Definitions of Flow \n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t\n<hr class=\"e-1dbcbca-13b842b e-divider-base\" data-interaction-id=\"1dbcbca\"  data-e-type=\"widget\" data-id=\"1dbcbca\" \/>\n\t\t\t\t<div class=\"elementor-element elementor-element-76c6a79 elementor-widget elementor-widget-text-editor\" data-id=\"76c6a79\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h3 data-pm-slice=\"1 1 []\">Volumetric Flow (Actual Volume Flow)<\/h3><p>Volumetric flow describes the physical volume of gas moving through a system per unit time. Typical units include:<\/p><ul><li>Cubic feet per minute (cfm)<\/li><li>Meters cubed per hour\u00a0(m<sup>3<\/sup>\/hr)<br \/><br \/><\/li><\/ul><p>Because gas volume expands or contracts with pressure and temperature, volumetric flow varies throughout a system. It is useful for evaluating duct sizing, velocities, and local system behavior, but it does not reflect the actual gas flow through the system. See the graphic below illustrating that, even though each enclosed box takes up the same amount of physical space, the number of gas particles and the gas properties (temperature and pressure) are very different and not ideal for evaluating the compressor\u2019s output.\u00a0<\/p><table border=\"1\" cellspacing=\"1\" cellpadding=\"1\"><tbody><tr><td><img decoding=\"async\" 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\" alt=\"\" \/><\/td><\/tr><tr><td><strong>V = 1 ft<sup>3<\/sup><\/strong><\/td><td><strong>V = 1 ft<sup>3<\/sup><\/strong><\/td><\/tr><tr><td>Fewer particles<\/td><td>More particles<\/td><\/tr><tr><td>Lower pressure<\/td><td>Higher pressure<\/td><\/tr><tr><td>Lower temperature<\/td><td>Higher temperature<\/td><\/tr><\/tbody><\/table><h3><br \/>Mass Flow<\/h3><p>Mass flow measures the actual quantity of gas molecules passing through a system, independent of pressure and temperature. Typical units include:<\/p><ul><li>Kilograms per second (kg\/s)<\/li><li>Pounds per hour (lb\/hr)<br \/><br \/><\/li><\/ul><p>Mass flow remains constant through compression and expansion and is the most physically accurate way to describe gas movement. For many process gas applications, mass flow is the preferred performance metric because it directly correlates with thermodynamic behavior and the amount of gas the process demands. The image below shows the same number of gas particles before and after compression; although their size and properties have changed, the mass remains constant.\u00a0<\/p><table border=\"1\" cellspacing=\"1\" cellpadding=\"1\"><tbody><tr><td><img decoding=\"async\" src=\"data:image\/png;base64,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\" alt=\"\" \/><\/td><td><img decoding=\"async\" src=\"data:image\/png;base64,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\" alt=\"\" \/><\/td><\/tr><tr><td><strong>V = 1 ft<sup>3<\/sup><\/strong><\/td><td><strong>V = 0.5 ft<sup>3<\/sup><\/strong><\/td><\/tr><tr><td>Same particles\/mass<\/td><td>Same particles\/mass<\/td><\/tr><tr><td>Lower pressure<\/td><td>Higher pressure<\/td><\/tr><tr><td>Lower temperature<\/td><td>Higher temperature\u00a0<\/td><\/tr><\/tbody><\/table><h3><br \/>Standardized (Pseudo-Mass) Flow<\/h3><div>Standardized flow measures volumetric flow to a defined set of reference conditions (temperature, pressure, relative humidity), allowing volumetric measurements to be compared as if they behaved like mass flow. For those familiar with volume flow, this is the easier-to-understand and more accurate flow measurement.\u00a0Typical units include:<br \/><br \/><\/div><ul><li>SCFM (standard cubic feet per minute)<\/li><li>Nm\u00b3\/hr or Nm\u00b3\/min (normal cubic meters cubed per hour)<br \/><br \/><\/li><\/ul><div><p>By normalizing flow to standard conditions, standardized flow enables fair comparisons between compressors operating under different inlet conditions, elevations, or ambient environments when using the same reference conditions. It uses a volumetric unit to describe the flow rate, but essentially represents a mass flow because the reference condition is defined. This is why it is also known as \u201cpseudo-mass\u201d flow.<\/p><p>Though mass flow better represents the number of gas particles you\u2019re getting out of your compressor, compressors are generally sized by volumetric flow rates. The illustration below shows compressor outputs at the same volumetric flow rate, differing in the number of particles\/mass and their respective pressures, temperatures, and relative humidities. At this point, there is little value in comparing the compressor outputs, as their operating conditions differ significantly, leading to varying densities and\u00a0masses.<\/p><table border=\"1\" cellspacing=\"1\" cellpadding=\"1\"><tbody><tr><td><img decoding=\"async\" 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alt=\"\" \/><\/td><td><img decoding=\"async\" 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alt=\"\" \/><\/td><\/tr><tr><td><strong>Flow = 1000 FAD (CFM)<\/strong><\/td><td><strong>Flow = 1000 FAD (CFM)<\/strong><\/td><\/tr><tr><td>P<sub>in<\/sub> = 14.5 PSIA<\/td><td>P<sub>in<\/sub>\u00a0= 14.8 PSIA<\/td><\/tr><tr><td>T<sub>in<\/sub> = 85<sup>\u00b0<\/sup>F<\/td><td>T<sub>in<\/sub>\u00a0= 50<sup>\u00b0<\/sup>F<\/td><\/tr><tr><td>RH = 60%<\/td><td>RH = 70%<\/td><\/tr><tr><td>Mass Flow = 71.39 lb\/min<\/td><td>Mass Flow = 78.36 lb\/min<\/td><\/tr><\/tbody><\/table><\/div><p>However, if we then take these two flows and redefine their volumetric flow rates to a standard set of conditions, say 14.7 PSIA, 60\u00b0F, and 0% RH, we can see that their standardized CFM flows are different and thus offer a better comparison of compressor output at multiple operating conditions. Though it is still technically measuring volume, the impacts of pressure, temperature, and relative humidity can be accounted for.\u00a0\u00a0<\/p><table border=\"1\" cellspacing=\"1\" cellpadding=\"1\"><tbody><tr><td><img decoding=\"async\" src=\"data:image\/png;base64,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\" alt=\"\" \/><\/td><td><img decoding=\"async\" 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alt=\"\" \/><\/td><\/tr><tr><td><strong>Flow = 917.81 SCFM (dry)<\/strong><\/td><td><strong>Flow = 1017.91 SCFM (dry)<\/strong><\/td><\/tr><tr><td>P<sub>in<\/sub>\u00a0= 14.5 PSIA<\/td><td>P<sub>in<\/sub>\u00a0= 14.8 PSIA<\/td><\/tr><tr><td>T<sub>in<\/sub>\u00a0= 85<sup>\u00b0<\/sup>F<\/td><td>T<sub>in<\/sub>\u00a0= 50<sup>\u00b0<\/sup>F<\/td><\/tr><tr><td>RH = 60%<\/td><td>RH = 70%<\/td><\/tr><tr><td>Mass Flow = 71.39 lb\/min<\/td><td>Mass Flow = 78.36 lb\/min<\/td><\/tr><\/tbody><\/table><div>\u00a0<\/div><h3>In Summary<\/h3><div><ul><li>Volumetric flow describes how much space the gas occupies<\/li><li>Mass flow measures the actual molecules of air moving<\/li><li>Standardized flow enables consistent comparison across systems by defining the standards by which the flow is measured.<\/li><\/ul><\/div><div>\u00a0<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9b3debe e-flex e-con-boxed e-con e-parent\" data-id=\"9b3debe\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-3b8bd35 e-con-full e-flex e-con e-child\" data-id=\"3b8bd35\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-af3347a elementor-widget elementor-widget-heading\" data-id=\"af3347a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Common Compressor Flow Units Explained<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t\n<hr class=\"e-67249cf-a8d5f7b e-divider-base\" data-interaction-id=\"67249cf\"  data-e-type=\"widget\" data-id=\"67249cf\" \/>\n\t\t\t\t<div class=\"elementor-element elementor-element-91fa71b elementor-widget elementor-widget-text-editor\" data-id=\"91fa71b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h3>ICFM \u2013 Inlet Cubic Feet per Minute<\/h3><p>ICFM represents the raw volumetric flow entering the compressor inlet, measured at actual inlet conditions.<\/p><ul><li>Not adjusted for temperature, pressure, or humidity<\/li><li>Useful for understanding intake conditions<\/li><li>Not suitable for performance comparison between differing inlet conditions<br \/><br \/><\/li><\/ul><h3>ACFM \u2013 Actual Cubic Feet per Minute<\/h3><p>ACFM represents volumetric flow at a specific point in the system, corrected for the local operating conditions at that location.<\/p><ul><li>Reflects the real volumetric flow rate at a specific point in the system<\/li><li>Varies throughout the system due to differences in temperature, pressure, and humidity at different points between the compressor inlet and discharge<\/li><li>In the compressor industry, the measured point is typically the compressor outlet, while the local conditions are taken at the inlet<\/li><li>Useful for evaluating velocities, losses, and system design<\/li><\/ul><h3><br \/>FAD \u2013 Free Air Delivery<\/h3><p>Free Air Delivery describes the usable volumetric flow delivered by the compressor, referenced back to defined inlet conditions and accounting for internal losses. It is also known as the delivered air flow at inlet conditions.<\/p><ul><li>Represents what the compressor actually delivers<\/li><li>Useful for evaluating real output versus nameplate claims<\/li><li>Often expressed in cfm or m3\/hr<\/li><li>In the compressor industry, FAD measured in cfm is used interchangeably with ACFM<\/li><\/ul><h3><br \/>SCFM \u2013 Standard Cubic Feet per Minute<\/h3><p>SCFM normalizes flow to standard reference conditions, commonly 14.7 PSIA, 60\u00b0F, 0% RH (though definitions may vary).<\/p><ul><li>Enables fair, apples-to-apples comparisons when the same SCFM definition is used<\/li><li>Commonly used for ratings and specifications<\/li><li>Only a valid comparison when the same reference conditions are used<\/li><li>Metric equivalent: Nm\u00b3\/hr or Nm\u00b3\/min<\/li><\/ul><div><h2><br \/>Flow Units at a Glance<\/h2><table border=\"1\" cellspacing=\"10\" cellpadding=\"5\"><tbody><tr><td><strong>Unit<\/strong><\/td><td><strong>Adjusted for Conditions<\/strong><\/td><td><strong>Where Measured<\/strong><\/td><td><strong>Practical Use<\/strong><\/td><\/tr><tr><td>ICFM<\/td><td>No<\/td><td>Compressor inlet<\/td><td>Shows raw intake volume<\/td><\/tr><tr><td>ACFM<\/td><td>Yes (local pressure\/temp\/humidity)<\/td><td>Any system point<\/td><td>Real flow under current conditions<\/td><\/tr><tr><td>FAD<\/td><td>Yes (to inlet conditions)<\/td><td>Compressor output<\/td><td>Shows the actual delivered volume<\/td><\/tr><tr><td>SFCM<\/td><td>Yes (to standard reference)<\/td><td>Compressor output<\/td><td>Fair comparison across systems<\/td><\/tr><\/tbody><\/table><div>\u00a0<\/div><div>In the context of air compressors specifically, the measuring points for these different flows can be shown as follows:<br \/><br \/><\/div><\/div><p><img decoding=\"async\" class=\"aligncenter wp-image-15777 size-full\" src=\"https:\/\/fs-elliott.com\/wp-content\/uploads\/2026\/10\/acfm-vs-scfm.png\" alt=\"\" width=\"481\" height=\"315\" srcset=\"https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/acfm-vs-scfm.png 481w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/acfm-vs-scfm-300x196.png 300w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/acfm-vs-scfm-18x12.png 18w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/acfm-vs-scfm-24x16.png 24w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/acfm-vs-scfm-36x24.png 36w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/acfm-vs-scfm-48x31.png 48w\" sizes=\"(max-width: 481px) 100vw, 481px\" \/><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-acbf072 e-flex e-con-boxed e-con e-parent\" data-id=\"acbf072\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-4051277 e-con-full e-flex e-con e-child\" data-id=\"4051277\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-005ccdb elementor-widget elementor-widget-heading\" data-id=\"005ccdb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How OEMs Interpret Flow Data\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t\n<hr class=\"e-07154a9-d60f106 e-divider-base\" data-interaction-id=\"07154a9\"  data-e-type=\"widget\" data-id=\"07154a9\" \/>\n\t\t\t\t<div class=\"elementor-element elementor-element-2269900 elementor-widget elementor-widget-text-editor\" data-id=\"2269900\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>From a compressor design standpoint, flow values are never evaluated in isolation. Engineers consider:<\/p><ul style=\"background: #ffffff; font-size: 16px;\"><li style=\"font-size: 16px;\">Measurement location<\/li><li style=\"font-size: 16px;\">Reference conditions<\/li><li style=\"font-size: 16px;\">Gas composition<\/li><li style=\"font-size: 16px;\">Operating pressure ratio<\/li><li style=\"font-size: 16px;\">System losses<\/li><\/ul><div><span style=\"font-size: 1rem;\"><br \/>Performance discrepancies almost always trace back to mismatches in flow definitions rather than to equipment shortcomings. Understanding the distinction between flow types leads to better equipment selection, more precise specifications, and smoother commissioning.<\/span><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-64dc535 e-flex e-con-boxed e-con e-parent\" data-id=\"64dc535\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-faa7828 e-con-full e-flex e-con e-child\" data-id=\"faa7828\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f19e2e7 elementor-widget elementor-widget-heading\" data-id=\"f19e2e7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Final Takeaway: What This Means for Compressor Selection<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t\n<hr class=\"e-31a5518-ffb8c5b e-divider-base\" data-interaction-id=\"31a5518\"  data-e-type=\"widget\" data-id=\"31a5518\" \/>\n\t\t\t\t<div class=\"elementor-element elementor-element-6694a44 elementor-widget elementor-widget-text-editor\" data-id=\"6694a44\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Understanding how air and gas flow are defined and measured is essential to making informed compressor decisions. Volumetric flow, mass flow, and standardized flow each serve a distinct purpose, but they are not interchangeable. Using the wrong reference can lead to inaccurate comparisons, misaligned expectations, and avoidable performance gaps all leading to lost production and higher costs.<\/p><p>From an OEM perspective, flow values only have meaning when evaluated in context. Measurement location, reference conditions, gas composition, pressure, and temperature all directly influence how flow should be interpreted. When these factors are clearly defined, compressor performance becomes predictable, comparable, and repeatable, both on paper and in operation.<\/p><p>For engineers and system designers, consistency is the key. Confirm which flow definition is being used and ensure all flow values are expressed on a common basis, using tools like <a href=\"https:\/\/fs-elliott-tools.com\/#aeroswap\">AeroSwap<\/a> to quickly convert between flow units and reference conditions before drawing conclusions. This approach leads to better equipment selection, smoother commissioning, and systems that perform exactly as intended.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3664fdb elementor-widget elementor-widget-button\" data-id=\"3664fdb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"\/fr\/contact-us\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-right\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M190.5 66.9l22.2-22.2c9.4-9.4 24.6-9.4 33.9 0L441 239c9.4 9.4 9.4 24.6 0 33.9L246.6 467.3c-9.4 9.4-24.6 9.4-33.9 0l-22.2-22.2c-9.5-9.5-9.3-25 .4-34.3L311.4 296H24c-13.3 0-24-10.7-24-24v-32c0-13.3 10.7-24 24-24h287.4L190.9 101.2c-9.8-9.3-10-24.8-.4-34.3z\"><\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">TALK TO AN EXPERT<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-14e8725f e-flex e-con-boxed e-con e-parent\" data-id=\"14e8725f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1b77e8cb elementor-widget elementor-widget-heading\" data-id=\"1b77e8cb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Frequently Asked Questions<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t\n<hr class=\"e-449fb832-3938290 e-divider-base\" data-interaction-id=\"449fb832\"  data-e-type=\"widget\" data-id=\"449fb832\" \/>\n\t\t\t\t<div class=\"elementor-element elementor-element-7b34aaf0 elementor-widget elementor-widget-n-accordion\" data-id=\"7b34aaf0\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;default_state&quot;:&quot;all_collapsed&quot;,&quot;max_items_expended&quot;:&quot;one&quot;,&quot;n_accordion_animation_duration&quot;:{&quot;unit&quot;:&quot;ms&quot;,&quot;size&quot;:400,&quot;sizes&quot;:[]}}\" data-widget_type=\"nested-accordion.default\">\n\t\t\t\t\t\t\t<div class=\"e-n-accordion\" aria-label=\"Accordion. Open links with Enter or Space, close with Escape, and navigate with Arrow Keys\">\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-2060\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"1\" tabindex=\"0\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-2060\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Is this information applicable to both air and gas compressors? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-2060\" class=\"elementor-element elementor-element-911f65 e-con-full e-flex e-con e-child\" data-id=\"911f65\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-579fa740 elementor-widget elementor-widget-text-editor\" data-id=\"579fa740\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">Yes. The principles of volumetric flow, mass flow, and standardized flow apply equally to compressed air and process gas applications. The primary difference lies in gas composition and reference conditions, not the measurement methodology.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-2061\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"2\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-2061\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Why do two compressors with the same SCFM rating perform differently? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-2061\" class=\"elementor-element elementor-element-3ae488eb e-con-full e-flex e-con e-child\" data-id=\"3ae488eb\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2507640b elementor-widget elementor-widget-text-editor\" data-id=\"2507640b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">SCFM alone does not capture inlet conditions, gas composition, pressure ratio, system losses, or physical differences between the machines. Two machines may share the same SCFM rating yet deliver different usable outputs under actual operating conditions. If the SCFM definitions are not the same, they are not measuring flow the same. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-2062\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"3\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-2062\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Should I use ACFM or SCFM when comparing compressors? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-2062\" class=\"elementor-element elementor-element-95e4323 e-con-full e-flex e-con e-child\" data-id=\"95e4323\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-79845431 elementor-widget elementor-widget-text-editor\" data-id=\"79845431\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">SCFM is best for comparing compressors across different environments. ACFM is more useful for analyzing volumetric flow output at the outlet of a compressor system. However, be aware that multiple standard conditions are used to define SCFM. Different standard conditions affect the value of SCFM because the basis differs. The table below shows examples of how the same ACFM flow rate can change when its equivalent SCFM value is defined to different standardized conditions.\u00a0<\/p><div><table border=\"1\" cellspacing=\"5\" cellpadding=\"5\"><tbody><tr><td><strong>Flow Unit<\/strong><\/td><td><strong>Value<\/strong><\/td><td><strong>Standard Condition Definition<\/strong><\/td><\/tr><tr><td><p>ACFM*<\/p><\/td><td><p>1000<\/p><\/td><td><p>&#8211;<\/p><\/td><\/tr><tr><td><p>SCFM<\/p><\/td><td><p>905<\/p><\/td><td><p>14.7 PSI(A) \/ 60\u00b0F \/ 0% RH<\/p><\/td><\/tr><tr><td><p>SCFM<\/p><\/td><td><p>923<\/p><\/td><td><p>14.7 PSI(A) \/ 70\u00b0 \/ 0% RH<\/p><\/td><\/tr><tr><td><p>SCFM<\/p><\/td><td><p>919<\/p><\/td><td><p>14.7 PSI(A) \/ 68\u00b0F \/ 0% RH<\/p><\/td><\/tr><tr><td><p>SCFM<\/p><\/td><td><p>918<\/p><\/td><td><p>14.5 PSI(A) \/ 60\u00b0F \/ 0% RH<\/p><\/td><\/tr><tr><td><p>SCFM<\/p><\/td><td><p>932<\/p><\/td><td><p>14.5 PSI(A) \/ 68\u00b0F \/ 0% RH<\/p><\/td><\/tr><\/tbody><\/table><\/div><div>\u00a0<\/div><div>*At the compressor outlet, defined to specified inlet conditions of 14.7 PSI(A), 95\u00b0F, 60% RH<\/div><div>\u00a0<\/div><div>Because SCFM correlates with mass flow, it reflects the effects of pressure, temperature, and humidity on compressor output,\u00a0unlike ACFM. The chart below shows ACFM and SCFM at varying site conditions under constant mass flow (constant wet SCFM), highlighting how reliance on ACFM can misrepresent performance and lead to incorrect compressor sizing.<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-2063\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"4\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-2063\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Is mass flow more accurate than SCFM? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-2063\" class=\"elementor-element elementor-element-6fea883 e-con-full e-flex e-con e-child\" data-id=\"6fea883\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-372b1562 elementor-widget elementor-widget-text-editor\" data-id=\"372b1562\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">Mass flow is the most physically accurate representation of the movement of the gas molecules. SCFM approximates mass flow by normalizing volumetric flow to standard conditions, making it easier to use for comparisons and specifications.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-2064\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"5\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-2064\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> What flow unit should be used for system design? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-2064\" class=\"elementor-element elementor-element-7191d7af e-con-full e-flex e-con e-child\" data-id=\"7191d7af\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-17c6565b elementor-widget elementor-widget-text-editor\" data-id=\"17c6565b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">System design typically relies on ACFM because it reflects the actual conditions at each point in the system. Compressor selection and comparison generally rely on SCFM or delivered volumetric flow. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-2065\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"6\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-2065\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Why does the inlet condition matter so much? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-2065\" class=\"elementor-element elementor-element-af53e9d e-con-full e-flex e-con e-child\" data-id=\"af53e9d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-277c396 elementor-widget elementor-widget-text-editor\" data-id=\"277c396\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\">Inlet pressure, temperature, and gas composition directly affect density. Even minor deviations from reference conditions can significantly change volumetric flow values and perceived compressor capacity. See below for illustrations showing the effect of temperature on density. The same mass of air occupies different volumes at different temperatures. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7fe31ef e-flex e-con-boxed e-con e-parent\" data-id=\"7fe31ef\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2b90771 elementor-widget elementor-widget-heading\" data-id=\"2b90771\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h5 class=\"elementor-heading-title elementor-size-default\">RELATED ARTICLES<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2815837 elementor-widget elementor-widget-heading\" data-id=\"2815837\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Insights &amp; Resources<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t\n<hr class=\"e-819eefc-90c7e73 e-divider-base\" data-interaction-id=\"819eefc\"  data-e-type=\"widget\" data-id=\"819eefc\" \/>\n\t\t\t\t<div class=\"elementor-element elementor-element-943b4a7 custom-blog-cards elementor-grid-3 elementor-grid-tablet-2 elementor-grid-mobile-1 elementor-posts--thumbnail-top elementor-posts--show-avatar elementor-card-shadow-yes elementor-posts__hover-gradient elementor-widget elementor-widget-posts\" data-id=\"943b4a7\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;cards_columns&quot;:&quot;3&quot;,&quot;cards_columns_tablet&quot;:&quot;2&quot;,&quot;cards_columns_mobile&quot;:&quot;1&quot;,&quot;cards_row_gap&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:35,&quot;sizes&quot;:[]},&quot;cards_row_gap_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;cards_row_gap_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"posts.cards\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-posts-container elementor-posts elementor-posts--skin-cards elementor-grid\" role=\"list\">\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-5320 post type-post status-publish format-standard has-post-thumbnail hentry category-podcasts\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/www.fs-elliott.com\/fr\/podcasts\/custom-aerodynamics-for-centrifugal-compressors\/\" tabindex=\"-1\" ><div class=\"elementor-post__thumbnail\"><img decoding=\"async\" width=\"300\" height=\"125\" src=\"https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode4-300x125.png\" class=\"attachment-medium size-medium wp-image-5324\" alt=\"Beyond Compression Blog Episode 4\" srcset=\"https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode4-300x125.png 300w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode4-768x320.png 768w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode4-18x8.png 18w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode4-24x10.png 24w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode4-36x15.png 36w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode4-48x20.png 48w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode4.png 960w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__badge\">Beyond Compression Podcast<\/div>\n\t\t\t\t<div class=\"elementor-post__avatar\">\n\t\t\t<img alt='Barbara Myers' src='https:\/\/secure.gravatar.com\/avatar\/b3b3ff64776e17b82b04ab87e1167f7bb460968a51cdd1b921ba007a0160074c?s=128&#038;d=mm&#038;r=g' srcset='https:\/\/secure.gravatar.com\/avatar\/b3b3ff64776e17b82b04ab87e1167f7bb460968a51cdd1b921ba007a0160074c?s=256&#038;d=mm&#038;r=g 2x' class='avatar avatar-128 photo' height='128' width='128' \/>\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fs-elliott.com\/fr\/podcasts\/custom-aerodynamics-for-centrifugal-compressors\/\" >\n\t\t\t\tCustom Aerodynamics for Centrifugal Compressors\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>A commonly overlooked factor behind compressor performance is the influence of on-site conditions and the impact they can have on compressor design, daily operation, and running costs. These factors can directly affect energy consumption, daily operations, and system efficiencies, which are critical metrics for facility operators.<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.fs-elliott.com\/fr\/podcasts\/custom-aerodynamics-for-centrifugal-compressors\/\" aria-label=\"En savoir plus sur Custom Aerodynamics for Centrifugal Compressors\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-6313 post type-post status-publish format-standard has-post-thumbnail hentry category-case-studies\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/www.fs-elliott.com\/fr\/case-studies\/steel-manufacturer-achieves-40k-annual-savings-with-centrifugal-compressor-upgrade\/\" tabindex=\"-1\" ><div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"125\" src=\"https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Untitled-960-x-400-px-300x125.png\" class=\"attachment-medium size-medium wp-image-6314\" alt=\"Industrial furnace processing equipment\" srcset=\"https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Untitled-960-x-400-px-300x125.png 300w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Untitled-960-x-400-px-768x320.png 768w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Untitled-960-x-400-px-18x8.png 18w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Untitled-960-x-400-px-24x10.png 24w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Untitled-960-x-400-px-36x15.png 36w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Untitled-960-x-400-px-48x20.png 48w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/Untitled-960-x-400-px.png 960w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__badge\">Case Studies<\/div>\n\t\t\t\t<div class=\"elementor-post__avatar\">\n\t\t\t<img alt='Barbara Myers' src='https:\/\/secure.gravatar.com\/avatar\/b3b3ff64776e17b82b04ab87e1167f7bb460968a51cdd1b921ba007a0160074c?s=128&#038;d=mm&#038;r=g' srcset='https:\/\/secure.gravatar.com\/avatar\/b3b3ff64776e17b82b04ab87e1167f7bb460968a51cdd1b921ba007a0160074c?s=256&#038;d=mm&#038;r=g 2x' class='avatar avatar-128 photo' height='128' width='128' \/>\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fs-elliott.com\/fr\/case-studies\/steel-manufacturer-achieves-40k-annual-savings-with-centrifugal-compressor-upgrade\/\" >\n\t\t\t\tSteel Manufacturer Achieves $40K Annual Savings with Centrifugal Compressor Upgrade\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>In stainless steel production, uninterrupted uptime isn\u2019t just a target; it\u2019s critical. From powering automation and actuators to supporting cooling and descaling systems, compressed air plays a crucial role in ensuring every part of the mill operates at peak performance.<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.fs-elliott.com\/fr\/case-studies\/steel-manufacturer-achieves-40k-annual-savings-with-centrifugal-compressor-upgrade\/\" aria-label=\"En savoir plus sur Steel Manufacturer Achieves $40K Annual Savings with Centrifugal Compressor Upgrade\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-4557 post type-post status-publish format-standard has-post-thumbnail hentry category-podcasts\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/www.fs-elliott.com\/fr\/podcasts\/how-to-specify-a-centrifugal-compressor-for-reliability-and-lower-lifecycle-costs\/\" tabindex=\"-1\" ><div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"125\" src=\"https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode8-300x125.png\" class=\"attachment-medium size-medium wp-image-5224\" alt=\"Beyond Compression Blog\" srcset=\"https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode8-300x125.png 300w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode8-768x320.png 768w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode8-18x8.png 18w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode8-24x10.png 24w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode8-36x15.png 36w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode8-48x20.png 48w, https:\/\/www.fs-elliott.com\/wp-content\/uploads\/2026\/10\/BeyondCompressionBlog960-Episode8.png 960w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__badge\">Beyond Compression Podcast<\/div>\n\t\t\t\t<div class=\"elementor-post__avatar\">\n\t\t\t<img alt='Barbara Myers' src='https:\/\/secure.gravatar.com\/avatar\/b3b3ff64776e17b82b04ab87e1167f7bb460968a51cdd1b921ba007a0160074c?s=128&#038;d=mm&#038;r=g' srcset='https:\/\/secure.gravatar.com\/avatar\/b3b3ff64776e17b82b04ab87e1167f7bb460968a51cdd1b921ba007a0160074c?s=256&#038;d=mm&#038;r=g 2x' class='avatar avatar-128 photo' height='128' width='128' \/>\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.fs-elliott.com\/fr\/podcasts\/how-to-specify-a-centrifugal-compressor-for-reliability-and-lower-lifecycle-costs\/\" >\n\t\t\t\tHow to Specify a Centrifugal Compressor for Reliability and Lower Lifecycle Costs\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>When specifying a centrifugal compressor, the decisions made during the engineering phase can influence far more than equipment selection. Compressor specifications affect reliability, efficiency, project costs, installation requirements, controls architecture, lead times, and long-term operational performance.<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.fs-elliott.com\/fr\/podcasts\/how-to-specify-a-centrifugal-compressor-for-reliability-and-lower-lifecycle-costs\/\" aria-label=\"En savoir plus sur How to Specify a Centrifugal Compressor for Reliability and Lower Lifecycle Costs\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<\/div>\n\t\t\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Learn how compressor flow is measured, including ACFM, SCFM, FAD, and mass flow, and why correct flow definitions are critical for accurate performance comparison.<\/p>","protected":false},"author":5,"featured_media":14379,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-15755","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ACFM vs SCFM vs FAD: Understanding Compressor Flow Measurements | FS-Elliott<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fs-elliott.com\/fr\/blog\/acfm-vs-scfm-vs-fad-understanding-compressor-flow-measurements\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ACFM vs SCFM vs FAD: 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